linux-kernel - Re: [PATCH v1 2/2] spi: Avoid potential UB when counting unused native CSs

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Message-ID: <20210420152203.GD6073@sirena.org.uk>
Date:   Tue, 20 Apr 2021 16:22:03 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] spi: Avoid potential UB when counting unused
 native CSs

On Tue, Apr 20, 2021 at 06:07:06PM +0300, Andy Shevchenko wrote:
> On Tue, Apr 20, 2021 at 03:56:16PM +0100, Mark Brown wrote:
> > On Tue, Apr 20, 2021 at 05:10:04PM +0300, Andy Shevchenko wrote:
> > > ffz(), that has been used to count unused native CSs, might produce UB

> > Bit of an IA there...

> UB -- undefined behaviour.
> I'll decode it. Should I decode CS as well?

CS is fine.

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